Table: Schedule of Investment Income, Reported Amounts, by Category [Table]

Line Label Object Class Period Type Balance Name
1 Schedule of Investment Income, Reported Amounts, by Category [Table] [Table]

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 us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable
2 Legal Entity [Axis] [Axis]

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 dei:LegalEntityAxis
3 Consolidated Entity [Domain] [Domain]

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 dei:EntityDomain
4 Category of Investment Income, Reported Amounts [Axis] [Axis]

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 us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryAxis
5 Investment Income, All Categories [Domain] [Domain]

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 us-gaap:InvestmentIncomeCategoriesDomain
6 Cash and Cash Equivalents [Member] [Member]

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 us-gaap:CashAndCashEquivalentsMember
7 Cash [Member] [Member]

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 us-gaap:CashMember
8 Demand Deposits [Member] [Member]

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 us-gaap:DemandDepositsMember
9 Cash Equivalents [Member] [Member]

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 us-gaap:CashEquivalentsMember
10 Money Market Funds [Member] [Member]

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 us-gaap:MoneyMarketFundsMember
11 Commercial Paper [Member] [Member]

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 us-gaap:CommercialPaperMember
12 Bankers Acceptance [Member] [Member]

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 us-gaap:BankersAcceptanceMember
13 Interest-bearing Deposits [Member] [Member]

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 us-gaap:InterestBearingDepositsMember
14 Bank Time Deposits [Member] [Member]

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 us-gaap:BankTimeDepositsMember
15 Certificates of Deposit [Member] [Member]

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 us-gaap:CertificatesOfDepositMember
16 Debt Securities [Member] [Member]

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 us-gaap:DebtSecuritiesMember
17 US Treasury and Government [Member] [Member]

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 us-gaap:USTreasuryAndGovernmentMember
18 US Treasury Securities [Member] [Member]

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 us-gaap:USTreasurySecuritiesMember
19 US Government Agencies Debt Securities [Member] [Member]

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 us-gaap:USGovernmentAgenciesDebtSecuritiesMember
20 US Government-sponsored Enterprises Debt Securities [Member] [Member]

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 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember
21 US States and Political Subdivisions Debt Securities [Member] [Member]

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 us-gaap:USStatesAndPoliticalSubdivisionsMember
22 Foreign Government Debt Securities [Member] [Member]

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 us-gaap:ForeignGovernmentDebtSecuritiesMember
23 Corporate Debt Securities [Member] [Member]

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 us-gaap:CorporateDebtSecuritiesMember
24 Domestic Corporate Debt Securities [Member] [Member]

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 us-gaap:DomesticCorporateDebtSecuritiesMember
25 Foreign Corporate Debt Securities [Member] [Member]

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 us-gaap:ForeignCorporateDebtSecuritiesMember
26 Commercial Paper, Not Included with Cash and Cash Equivalents [Member] [Member]

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 us-gaap:CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
27 Convertible Debt Securities [Member] [Member]

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 us-gaap:ConvertibleDebtSecuritiesMember
28 Asset-backed Securities [Member] [Member]

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 us-gaap:AssetBackedSecuritiesMember
29 Collateralized Mortgage Backed Securities [Member] [Member]

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 us-gaap:MortgageBackedSecuritiesMember
30 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] [Member]

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 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
31 Mortgage-backed Securities, Issued by Private Enterprises [Member] [Member]

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 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
32 Residential Mortgage Backed Securities [Member] [Member]

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 us-gaap:ResidentialMortgageBackedSecuritiesMember
33 Commercial Mortgage Backed Securities [Member] [Member]

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 us-gaap:CommercialMortgageBackedSecuritiesMember
34 Collateralized Debt Obligations [Member] [Member]

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 us-gaap:CollateralizedDebtObligationsMember
35 Asset-backed Securities, Securitized Loans and Receivables [Member] [Member]

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 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
36 Interest-Only-Strip [Member] [Member]

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 us-gaap:InterestOnlyStripMember
37 Principal-Only-Strip [Member] [Member]

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 us-gaap:PrincipalOnlyStripMember
38 Fixed Income Securities [Member] [Member]

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 us-gaap:FixedIncomeSecuritiesMember
39 Auction Rate Securities [Member] [Member]

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 us-gaap:AuctionRateSecuritiesMember
40 Variable Rate Demand Obligation [Member] [Member]

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 us-gaap:VariableRateDemandObligationMember
41 Other Debt Obligations [Member] [Member]

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 us-gaap:OtherDebtSecuritiesMember
42 Equity Securities [Member] [Member]

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 us-gaap:EquitySecuritiesMember
43 Common Stock [Member] [Member]

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 us-gaap:CommonStockMember
44 Preferred Stock [Member] [Member]

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 us-gaap:PreferredStockMember
45 Nonredeemable Preferred Stock [Member] [Member]

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 us-gaap:NonredeemablePreferredStockMember
46 Redeemable Preferred Stock [Member] [Member]

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 us-gaap:RedeemablePreferredStockMember
47 Convertible Preferred Stock [Member] [Member]

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 us-gaap:ConvertiblePreferredStockMember
48 Partnership Interest [Member] [Member]

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 us-gaap:PartnershipInterestMember
49 Schedule of Investment Income, Reported Amounts, by Category [Line Items] [Line Items]

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 us-gaap:ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems
50 Investment Income [Table Text Block] [Concept] Text Block (HTML) For Period

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 us-gaap:InvestmentIncomeTextBlock
51 Investment Income, Net [Roll Up] [Abstract]

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 us-gaap:InvestmentIncomeNetAbstract
52 Investment Income, Interest and Dividend [Roll Up] [Abstract]

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 us-gaap:InvestmentIncomeInterestAndDividendAbstract
53 Investment Income, Interest [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeInterest
54 Investment Income, Dividend [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeDividend
55 Investment Income, Interest and Dividend, Total [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeInterestAndDividend
56 Investment Income, Net, Amortization of Discount and Premium [Roll Up] [Abstract]

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 us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremiumAbstract
57 Investment Income, Amortization of Discount [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeAmortizationOfDiscount
58 Investment Income, Amortization of Premium [Concept] Monetary For Period Debit us-gaap:InvestmentIncomeAmortizationOfPremium
59 Investment Income, Net, Amortization of Discount and Premium, Total [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeNetAmortizationOfDiscountAndPremium
60 Investment Income, Investment Expense [Concept] Monetary For Period Debit us-gaap:InvestmentIncomeInvestmentExpense
61 Investment Income, Net, Total [Concept] Monetary For Period Credit us-gaap:InvestmentIncomeNet